A woman who may have been accidentally bumped by a college student on a subway ride Wednesday morning stabbed the student and her boyfriend as they left a Queens station. The fray knocked a third person down an escalator, witnesses and authorities said.

Leaving the medical center Wednesday afternoon, Allsop, of Far Rockaway, her arms bandaged, said she was helped by others, including Antoine, when Saint-Fleur began slashing at her with a 2-inch folding knife while they were on the escalator.

Allsop said she was walking up the escalator to leave the station on her way to Queensborough Community College, where she is a psychology student, and that Saint-Fleur, who was riding up the escalator, suddenly grabbed her by the jacket and said Allsop had bumped into her.

Saint-Fleur slashed both Allsop and Antoine, who was on his way to work at a hospital, according to Allsop and the MTA.

"God bless her and give her some help," Allsop said of the accused assailant.

Saint-Fleur was charged with three counts of first-degree assault, three counts of second-degree menacing and one count of fourth-degree criminal possession of a weapon, the MTA said.